In 1971 it was hypothesised that intergenerational value changes were taking place. More than a generation has passed since then, and today it seems clear that the predicted changes have occurred. A large body of evidence, analysed using three different approaches -- (1) cohort analysis; (2) comparisons of rich and poor countries; (3) examination of actual trends observed over the past 35 years -- all points to the conclusion that major cultural changes are occurring, and that they reflect a process of intergenerational change linked with rising levels of existential security.